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Accounts Receivable - Accounts Receivable, Net of Allowances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Accounts receivable $ 74,475 $ 91,596
Less: allowance for doubtful accounts and sales returns (4,631) (4,831)
Accounts Receivable, Net, Current, Total $ 69,844 $ 86,765